7 votes
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For robot wheel control : Brushless DC motor or Servo Motor?

Let's try and clear things up a little bit... "RC Servo" motors These can be found in radio controlled cars and airplanes to e.g. turn the wheel or actuate various controls in the airplane. They ...
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7 votes

Explanation of Quadcopter Dynamics, Components and Control

A couple things, the first is that the controller does not really care what the "real" values are. Everything is relative, if the controller sees that it is sinking it will increase the thrust until ...
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7 votes
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Using brushless motors for very high torque

Your expectations are rather aggressive for a DC motor. First - 40Nm (350in-lbs) is A LOT of torque! Ex: A max rated torque for 1/4-20 bolt is only 75 in-lb (8.5Nm). Second - The mechanical power ...
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6 votes

What are some ways to estimate torque/load on a robotic arm joint

Model Based: Low cost solution is always software: Develop a dynamic model which computes the load on the motors based on the motions (e.g. with Recursive Newton Euler Algorithm or Lagrange-Euler ...
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4 votes
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How to control ESC from Arduino?

There are quite a few issues I see with your setup. You are setting up the ESC in your code to use pin 9, but your diagram shows that you've connected to pin 8. Pin 8 won't do anything because the ...
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3 votes
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Highspeed with gearbox or low speed for brushless motor?

Page 7 of this PDF states that, "A permanent magnet DC brushless motor behaves like any permanent magnet DC brush motor." You can read more about DC motor operation at this MIT site. I'm not sure if ...
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3 votes
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thrust measurement

Okay I thought I'd move this to an answer because I think this will help clear up some confusion you have. First, if you are trying to plot RPM vs Thrust, then your battery, ESC, power, etc. have ...
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3 votes
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Voltage rpm relation

You can't understand this because you don't know what you observe. The electromotive force (EMF) of your motor is proportional to its speed (the ratio is called Kv). So, when the speed of your motor ...
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3 votes
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What happens when a brush-less motor stalls?

Your equipment will be fine as long as the stall periods aren't too big(like 5 minutes). I think the first thing to fail is the ESC as you're using half the voltage the motor is rated for. You also ...
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3 votes
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Will a 20amp ESC run a Turnigy 2213-980?

In process of selection of components for multirotor, one should start from motor as it is the driving component. Maximum current drawn by your motor is given by manufacture which is 15A. Now your ESC ...
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Does it matter if my electronic speed controllers are close to my brushless motors?

First, you can look at Mikrokopter as an example of quad with centrally mounted ESCs. As for the various engineering reasons for ESC location, here is some rationale behind the two you mentioned 1) ...
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3 votes

Can i use DC Brushed motors for building a drone?

I would definately look at brushed motor when the budget is low. They have a reputation of being less powerful but the main problem is they have a very high RPM. This means you either have to use very ...
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3 votes
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What is the typical weight distribution for a brushless motor?

I took apart a Turnigy D2836 brushless DC motor. Despite the weight listed on the website, the actual weight of the motor without the mounting equipment is 54 Grams. Here is the breakdown Magnets: 9 ...
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3 votes

Electronic Speed Controller

It depends on the voltage. Say you are running 12V: 1820W / 12V = 151A With a 24V system: 1820W / 24 = 75A
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2 votes

Can I reuse the hall sensors in a brushless motor as an encoder?

I would think you should be able to. I've used magnets and reed switches in a similar application for a speed sensor which uses the turns to calculate speed much like an encoder and it worked ...
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2 votes

Can I use a PWM HHO Controller to control a brushless DC motor?

Practically all brushless motors require 3 independent power connections, each one at the appropriate frequency and 3 different phases. Those 3 power cables are typically connected to a brushless ESC. ...
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2 votes

Electronic Speed Control Concepts

First a little warning: This answer is one big AFAIK. I have some limited experience with RC electronics and don't know anything about industrial servos, and other simillar stuff :-) BLDC motors (...
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2 votes

Quadcopter Propeller size + Motor

The Information you provide are a bit short. This depends a lot on the power of the motors. See my answer on this question: Choosing motor for a tricopter If you choose some a motor big enought for ...
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2 votes

What happens when a brush-less motor stalls?

Motors stalling can take many amps as you have found out. In the electrical industry three types of overload cut out are available. fuse, trip, auto resetting trip. A more suttle way is to monitor ...
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2 votes

How to calculate the current consumed by a brushless motor on a quadcopter

n = Kv * Vin only when there is no load on the motor. When there is a load on the motor, like from a propeller, you will need to be a bit more clever. For a DC motor (which BLDC motors approximate by ...
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2 votes

How do I if know my quad is powerful enough to take off vertically smoothly and how do I calculate max Thrust(g) for given current(A) and voltage(V)?

You're really asking two questions here: Will the motors and propellers be able to provide enough thrust to lift the weight of the quadcopter? There's no substitute for measurement here. Get one ...
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2 votes

Why does the ESC stop?

First of all I would suggest calibrating them. From the eBay page you linked to, It would seem that the ESCs are probably HobbyWing (or HobbyWing clones). I would suggest finding some spec sheets for ...
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2 votes
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Bldc motors erratic behavior with Arduino program

Can you make a written description (comments, text, or block diagram) of what you think the code is supposed to be doing? I can't figure out what your whole timer scheme is supposed to do. Here's ...
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2 votes

Explanation of Quadcopter Dynamics, Components and Control

You're right. You should know the rpm of your propellers to build a mathematical model of your quadcopter and if you already have a mathematical model of your brushless DC motors you could compute ...
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2 votes
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Confirm my understanding on BLDC motors

Now if i power the ESC with 48V instead of 16V and set it to 33% instead of 100% The effective voltage on the motor is still 16V and the motor will still use 48W, but since the ESC is getting 48V it ...
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2 votes

Why the bldc motor not able to move my water boat?

It sounds to me like you've got cavitation. Basically, the blades are turning so fast that the water around the blades boils. Boiling can happen at normal pressure and high temperature, like on a ...
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2 votes
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Is a larger Kv equivalent to more voltage?

OK so lets start with Please correct me if I'm wrong As I understand, a brushless motor has a maximum torque and power (Watts), if you push it beyond its limits ...
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2 votes

Are all drone propellers compatible with all brushless motors?

Not at all. It is about efficiency, agility, and maneuverability of your drone. Just like wheels on a car, the size of the propeller needs to be matched to the rest of the power system. For ...
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2 votes
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Do mobile robots use variable transmissions?

For a simple answer: no, most mobile robots do not use variable transmissions. I believe it is far easier to just design a motor and gearbox combination that works well in your narrow range of ...
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2 votes

Is it uncommon to use a gearbox with a brushless motor?

Yes, brushless and grearbox is a normal usecase. Due to the popular application of using brushless motors on drone propellers other applications are harder to find. The keywords "Brushless ...
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